(19)

(11)

EP 1 741 264 A2

(12)

(88) Date of publication A3: 30.03.2006 (43) Date of publication: 10.01.2007 Bulletin 2007/02 (21) Application number: 05735642.0 (22) Date of filing: 19.04.2005

(51) International Patent Classification (IPC):  H04L 29/06(2006.01) H04L 29/12(2006.01) (86) International application number: PCT/GB2005/001507 (87) International publication number: WO 2005/104480 (03.11.2005 Gazette 2005/44)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR (30) Priority: 21.04.2004 GB 0408890 (71) Applicant: Orange SA 75015 Paris Cedex 15 (FR)	(72) Inventor: CHEN, Xiaobao Wiltshire SN5 5DQ (GB) (74) Representative: DeVile, Jonathan Mark  D Young & Co 120 Holborn London EC1N 2DY London EC1N 2DY (GB)